• Volume I: Introduction

• Volume II: Point Sources

• Volume III: Area Sources and Area Source Method Abstracts

• Volume IV: Mobile Sources

• Volume V: Biogenics Sources

• Volume VI: Quality Assurance/Quality Control

• Volume VII: Data Management Procedures

• Volume IX: Particulate Emissions

• Volume X: Emission Projections

The EIIP documents are available electronically through the EPA website at

http://www.epa.gov/ttn/chief/eiip/techreport/. The quality assurance procedures contain

essential steps for inventory preparation, which help assure that the emission inventory is

appropriate for SIP air quality modeling.

Therefore, before projecting the baseline to the future, it may be necessary to remove certain

day-specific inventory information and replace it with average data. This issue is not a concern

for day-specific mobile source or biogenic emissions data which are dependent on day specific

(or even hourly) meteorological data for the time periods modeled.


17.2 Can The National Emission Inventory Be Used As a Starting Point?

We recommend that States and Tribes start with available inventories suitable for air

quality modeling of the selected time period(s). If no such inventory is available, States/Tribes

may derive an inventory suitable for use with models starting from the National Emission

inventory (NEI), available from http://www.epa.gov/ttn/chief/net/. The 2002 NEI can be used as

a starting for inventory development. However, the detail and accuracy of the emissions in the

NEI may not be sufficient for use in attainment demonstration modeling. NEI data may be

sufficient for estimating emissions in States that are hundred of kilometers downwind of the

nonattainment area, but may not be sufficient for estimating local emissions that are critically

important in estimating ozone or PM in the nonattainment area. Thus, States/Tribes should

review the contents of the NEI for accuracy and completeness for regional and local scale

modeling and amend the data where it is insufficient to meet the needs of the local air quality

model application. While some benefits can be realized for states using the same inventory

(such as the NEI) as a starting point for their work, the more important goal for SIP inventory

development is to ensure that the data are representative and accurate enough for making good

control strategy decisions.


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